Armored cable



March 1933. o. A. FREDERICKSON 1,900,

ARMORED CABLE Filed April 1, 1930 Patented Mar. 7, 1933 UNITED STATES PATENT, OFFICE OTTO A. FREDERICKSON, OF BEN AVON, PENNSYLVANIA, ASSIGNOR T0 NATIONAL ELECTRIC PRODUCTS CORPORATION, OF NEW YORK, N. Y., A CORPORATION OF DELA- WARE ARMORED cABLE Application filed April 1, 1930. Serial No. 440,682.

This invention relates to an improved armored cable which is cheaper to manufacture than cables now in use.

One construction of cable which is now upon the market comprises a central conductor over which is applied a covering of rubber. Over the rubber is a covering or braided cotton which is exteriorly impregnated with an asphaltic saturant. Over the asphaltic saturant there is provided a flame retardent coating of stearin pitch, and this coating is surrounded by a wax paper wrapping or serving preferably of transversely crumpled paper and about the whole is the usual metallic armor.

According to the present invention the construction of the cable is simplified and --cheapened by the provision of a different kind of covering for the cotton braided covering which has heretofore been used intermediate the rubber insulation of the asphaltic saturant.

Further and other objects of the present invention will be hereinafter set forth in the accompanying specification and claims and shown in the drawing which by way of illustration shows what I now consider to be a preferred embodiment of the invention.

In the drawing:

Figure 1 shows an armored cable incorporating the present improvements.

In the drawing, 10 is the central copper conductor which is preferably tinned. Over this is disposed the usual r%ber insulation 11 which is vulcanized in the usual way. Over the rubber in lieu of using the wrappings heretofore used, I provide multiple tape-like servings 12 of fibrous fabric such as cotton cloth. By employing such servings of tapelike character of fibrous. material, it is possible to cheapen the manufacture of the cable inasmuch as cotton tape-like servings may be applied at relatively higher speed than the previous coverings whichbeing of braid construction required a relatively slow operation in a braiding machine to apply the same. Preferably such tape-like servings 12 are arranged in a single layer as shown with the adjacent tapes abutting edge to edge. Over the servings 12 there is. placed a layer of asphaltic saturant 13 which material 13 im pregnates through the tapes 12 and sticks the latter to the rubber covering 11. Over the asphalt is placed a coating 14 of stearin pitch which serves as a flame retardent material. In certain cases, this coating 14 may be dispensed with. Over the stearin pitch there are placed servings 15 of transversely crumpled paper having a quantity of wax incorporated therein. Over the insulated cable there is disposed the usual metallic armor 16.

While the invention is shown and described in connection with a single conductor, it is obvious that the invention is not limited to a single conductor and that multiple conductors may be employed. With multiple conductors each conductor would be provided with a rubber covering 11, fibroustapelike servings 12, the saturant 13 and coating 14 (or such coating may be dispensed with if desired). In lieu of individually wrapping the insulated conductors with the servings 15, preferably a plurality of insulated conductors for example a pair, would be wrapped by the same servings 15. The armor 16 would be used as before.

I claim:

1. An anchored cable having an outer flexible metallic armor and a cable therein comprising a central conductor having a rubber covering therearound, multiple separate individual tape-'llke fabric servings about said rubber covering immediately adjacent and directly abutting the same, an asphaltic saturant applied exteriorly to the fabric servings and impregnating the same and sticking the individual servings to the rubber covering, and transversely crumpled paper servings forming the exterior covering for the cable adjacent the inner walls of the armor.

2. The invention set forth in claim 1 in which a stearin pitch coating is applied over the asphaltic saturant and beneath the transversely crumpled paper servings.

3. The invention set forth in claim 1 in which the fibrous servings over the rubber comprise a multiplicity of tape-like strands which strands abut edge to edge with adjacent strands.

2 readers 4. An insulated Wire comprising a central conductor, a vulcanized rubber covering therefor, separate individual servings of fibrous fabric therearound immediately adjacent and directly abutting the vulcanized rubber covering, asphaltic material impregnating saidfibrous servings and also sticking the said individual servings to the rubber covering thereunder, and an outer stearin pitch-like coating: over the asphaltic coating for the purpose described.

5. An insulated wire -or cable comprising a central conductor having-a rubber coverin therearound, multiple separate individua tape-like fabric servings about said rubber covering and directly abutting the same, an asphaltic saturant applied exteriorly to the fabric servings and impregnating the same and sticking the servings to the rubber covering which the individual servings abut, and a stearin pitch coating over the asphaltic .1 sat-urant for the purpose described.

In testimony whereof I hereto aifix my signature.

OTTO A. I FREDERICKSON.

' CERTIFICATE OF CORRECTION;

Patent No. 1,9oo,LL92'. March 7, 19

' orrc A. FREoERIpKsoN. Y It is hereby certified that error appears the printed specification of the above numbred patent requiring .correcti on as-followsz Page 1, .line

7, .for the word "or," read of; and line 78, for anchored't read armored;

and that the 1 said Letters Patent should he read with th is correction the rein v that'.the same may conform to the record of thecase in the.Patent Office.

Signedvand sealed this 20th day of December, A. D. 1958;

Henry Van A rsdaIe (Seal) Acting Commissioner of Patents. 

